丘陵山地针阔混交林光合作用-光响应特性研究

为探讨丘陵山地针阔混交林中杉木、马尾松、红榉、闽楠、南酸枣5个混交树种对光环境的适应及生理响应,对5个混交树种树冠上、下层叶绿素含量、净光合速率、光响应曲线等光合特性进行了研究。结果表明:混交林中各树种净光合速率与树冠部位、叶绿素含量均达到显著相关性。闽楠叶绿素a/b最低,并具有较高的表观量子效率,为耐阴树种;南酸枣与红榉的叶绿素a/b较高,表观量子效率较低,为喜光树种;杉木、马尾松叶绿素a/b和表观量子效率居中,为喜光树种,略耐阴。闽楠、红榉、杉木光适应幅度较大,且兼具不同需光特性,是适宜的针阔混交造林配置树种。

Study on photosynthesis and photo-response characteristics of needle and broad-leaved mixed forest in hilly mountains

To provides theoretical basis for the allocation and afforestation model of mixed afforestation species,photosynthetic characteristics including green content, net photosynthetic rate and light response,etc were studied of 5 mixed tree species: Cunninghamia lanceolata, Pinus massoniana, Zelkova serrata, Phoebe bournei,Choerospondias axillaris in hilly mountains,to reveal the adaptation of photosynthetic and physiological characteristics of environment. The results showed that significant correlation between net photosynthetic rate with crown site and chlorophyll content. P.bournei was a shade-tolerant tree species,with the lowest chlorophyll a/b and high apparent quantum efficiency;Z.serrata and C.axillaris were hilight tree species,with high chlorophyll a/b and low apparent quantum efficiency;C.lanceolata and P.massoniana were hilight tree species,and slightly shade resistant,with chlorophyll a/b and apparent quantum efficiency centered. The light adaptation range of P.bournei, Z.serrata and C.lanceolata were relatively wide, were suitable for mixed afforestation,with different optical characteristics.